Propelling a Rod in Space with an Electric Motor

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Discussion Overview

The discussion revolves around the feasibility of propelling a rod in space using an electric motor, with considerations of propulsion methods, energy production, and material properties in a vacuum environment. The scope includes theoretical and conceptual aspects of physics and engineering applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a scenario involving a large electric motor with a rod accelerated by an external force in space.
  • Another participant argues that the fuel production for a rocket would negate the power generated by the motor, emphasizing the lack of air resistance in a vacuum.
  • A different viewpoint suggests that the rocket is only needed to initiate motion, proposing the use of a large generator and superconducting materials to enhance efficiency in low-temperature environments.
  • One participant counters that superconducting materials do not eliminate opposing electromagnetic forces, highlighting the complexities of the system.

Areas of Agreement / Disagreement

Participants express differing views on the practicality and efficiency of using an electric motor and external propulsion in space, with no consensus reached on the feasibility of the proposed system.

Contextual Notes

Participants note limitations regarding the assumptions about energy production, the role of superconductivity, and the implications of operating in a vacuum, which remain unresolved.

EEstudentNAU
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Here is the situation. A large electric motor has a long rod attached at a 90º to the motor shaft and is accelerated at the end of the rod by something (rocket, fan, etc) and is in space (a vacuum). Thoughts?
 
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The production of the fuel for rocket would out-weigh the power created by the generator. There's no wind in space to push a fan. I think that the fact that it's in a vacuum only buys you freedom from the friction of "air" and gravity on the system.
 
The rocket would just be to get it started, to accelerate it to a high speed. I'm talking about an extremely large generator producing megawatts. The temperature in space is in the low kelvins, let's say 40k or less in the areas where we would be using this device, like in a deep crater on the moon that never receives sunlight. Using superconducting materials will eliminate resistance.
 
Using superconducting materials does not eliminate the electromagnetic forces that oppose the rotation of the motor. That's not resistance. There is no free lunch.
 

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